General Spec Screen LCD screen FM Frequency 87.5MHz-108MHz, stepping is 0.1MHz Function ideal for charging for your iPod. Compatibility iPod Nano, Touch, Video, Classic, iPhone 2G/3G/3GS/4G Features Internal decoding support for all the SD cards and U disks to use. FM transmitter suitable for iPod Nano, Touch, Video, Classic, iPhone 2G/3G/3GS/4G. It has 27 volume adjustments and 6 sound adjustment, and it also supports external audio input adjustment. Output frequency is 87.5MHz-108MHz, stepping is 0.1MHz. LCD can directly display current playing state. Luminaire on product can effectively ensure convenient operation at night and adorn the internal space to help you enjoy music.